.line-sidebar {
  --accent-color: #a855f7;
  --text-color: #c4c4c4;
  --marker-color: #6c6c6c;
  --marker-length: 60px;
  --marker-gap: 0px;
  --tick-scale: 0.5;
  --max-shift: 30px;
  --item-gap: 20px;
  --font-size: 1.1rem;
  --smoothing: 100ms;

  position: relative;
  display: flex;
  justify-content: flex-start;
  width: 100%;
}

.line-sidebar--markers {
  padding-left: calc(var(--marker-length) + var(--marker-gap));
}

.line-sidebar__list {
  list-style: none;
  margin: 0;
  padding: 0.5rem 0;
  display: flex;
  flex-direction: column;
  gap: var(--item-gap);
  width: 100%;
}

.line-sidebar__item {
  position: relative;
  cursor: pointer;
}

.line-sidebar__item::before {
  content: '';
  position: absolute;
  inset: -6px -8px;
}

.line-sidebar__label {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  max-width: 100%;
  font-family: var(--font-body, system-ui, sans-serif);
  font-size: var(--font-size);
  line-height: 1.2;
  color: color-mix(in srgb, var(--accent-color) calc(var(--effect, 0) * 100%), var(--text-color));
  transform: translateX(calc(var(--effect, 0) * var(--max-shift)));
}

.line-sidebar__text {
  word-break: break-word;
}

.line-sidebar__index {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  margin-right: 0.65rem;
  font-size: 0.9em;
  opacity: calc(0.55 + var(--effect, 0) * 0.45);
}

.line-sidebar__marker {
  position: absolute;
  top: 50%;
  left: calc(-1 * var(--marker-length) - var(--marker-gap));
  height: 1px;
  width: var(--marker-length);
  background-color: color-mix(in srgb, var(--accent-color) calc(var(--effect, 0) * 100%), var(--marker-color));
  transform-origin: left center;
  transform: translateY(-50%) scaleX(calc(0.7 + var(--effect, 0) * 0.5));
}

.line-sidebar--markers .line-sidebar__item:not(:last-child)::after {
  content: '';
  position: absolute;
  top: calc(100% + var(--item-gap) / 2);
  left: calc(-1 * var(--marker-length) - var(--marker-gap));
  height: 1px;
  width: calc(var(--marker-length) * var(--tick-scale));
  background-color: var(--marker-color);
  opacity: 0.5;
  transform: translateY(-50%);
}

.line-sidebar--scale-tick .line-sidebar__item:not(:last-child)::after {
  transform-origin: left center;
  transform: translateY(-50%) scaleX(calc(0.7 + var(--effect, 0) * 0.6));
}

/* Site-wide sidebar shell */
.app-shell {
  display: block;
  min-height: 100vh;
  min-height: 100dvh;
  overflow-x: clip;
}

.site-sidebar {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 200;
  width: var(--sidebar-width);
  background: linear-gradient(180deg, var(--white) 0%, var(--surface) 100%);
  border-right: var(--border-subtle);
  box-shadow: var(--shadow-soft);
  padding: max(1.75rem, var(--safe-top)) 1.65rem max(1.5rem, var(--safe-bottom)) max(1.65rem, var(--safe-left));
  display: flex;
  flex-direction: column;
  gap: 0;
  overflow: hidden;
  transition: transform 0.35s ease;
}

.site-sidebar__logo {
  flex-shrink: 0;
  align-self: stretch;
  width: calc(100% + 2.4rem);
  margin-left: -1.2rem;
  margin-right: -1.2rem;
  line-height: 0;
  text-decoration: none;
  padding-bottom: 0.25rem;
  margin-bottom: 0.15rem;
}

.site-sidebar__logo-img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 840 / 236;
  object-fit: contain;
  object-position: center;
}

.site-sidebar__logo-text {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(2.15rem, 4.5vw, 2.65rem);
  font-weight: 400;
  letter-spacing: 0.015em;
  color: var(--charcoal);
}

.site-sidebar__logo-tagline {
  display: block;
  margin-top: 0.55rem;
  font-family: var(--font-body, system-ui, sans-serif);
  font-size: 0.6rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

.site-sidebar__drawer {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.site-sidebar__drawer .site-sidebar__logo {
  flex-shrink: 0;
  align-self: stretch;
  width: 100%;
}

.site-sidebar__nav {
  flex: 0 0 auto;
  min-height: 0;
  overflow: visible;
  padding-right: 0.25rem;
}

.site-nav {
  width: 100%;
}

.site-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.site-nav__link {
  display: block;
  padding: 0.5rem 0;
  font-family: var(--font-body, system-ui, sans-serif);
  font-size: 0.98rem;
  font-weight: 400;
  line-height: 1.35;
  letter-spacing: 0.03em;
  color: rgba(82, 74, 46, 0.62);
  text-decoration: none;
  transition: color 0.2s ease;
}

.site-nav__link[aria-current="page"] {
  color: var(--charcoal);
  font-weight: 500;
}

.site-nav__link:hover,
.site-nav__link:focus-visible {
  color: var(--olive);
}

.site-sidebar__footer {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  padding-top: 0.75rem;
  margin-top: auto;
}

.site-sidebar__footer .nav__lang {
  align-self: flex-start;
}

.site-sidebar__footer .nav__book {
  width: 100%;
  justify-content: center;
}

.site-sidebar__quiz-panel {
  position: relative;
  padding: 1rem 1rem 1rem 1.1rem;
  background: var(--surface-warm);
  border: 1px solid rgba(82, 74, 46, 0.1);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.site-sidebar__quiz-eyebrow {
  margin: 0 0 0.55rem;
  font-size: 0.58rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--olive);
}

.site-sidebar__quiz {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.2rem;
  width: 100%;
  padding: 0 1.75rem 0 0;
  background: none;
  border: none;
  text-align: left;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.site-sidebar__quiz-title {
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 500;
  line-height: 1.25;
  color: var(--charcoal);
  transition: color 0.25s ease;
}

.site-sidebar__quiz-sub {
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 400;
  letter-spacing: 0.03em;
  color: var(--muted);
  transition: color 0.25s ease;
}

.site-sidebar__quiz::after {
  content: '→';
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.95rem;
  color: var(--terracotta);
  transition: transform 0.25s ease, color 0.25s ease;
}

.site-sidebar__quiz:hover .site-sidebar__quiz-title,
.site-sidebar__quiz:focus-visible .site-sidebar__quiz-title {
  color: var(--olive);
}

.site-sidebar__quiz:hover .site-sidebar__quiz-sub,
.site-sidebar__quiz:focus-visible .site-sidebar__quiz-sub {
  color: var(--umber);
}

.site-sidebar__quiz:hover::after,
.site-sidebar__quiz:focus-visible::after {
  color: var(--terracotta);
  transform: translate(3px, -50%);
}

.site-sidebar__toggle {
  display: none;
  position: fixed;
  top: max(0.85rem, var(--safe-top));
  left: max(1rem, var(--safe-left));
  z-index: 5010;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: var(--white);
  border: 1px solid rgba(82, 74, 46, 0.22);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  transition: background 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.site-sidebar__toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--olive);
  margin: 3px 0;
  transition: transform 0.3s ease, opacity 0.3s ease, background 0.25s ease;
}

.site-sidebar__toggle:hover,
.site-sidebar__toggle:focus-visible {
  border-color: rgba(82, 74, 46, 0.38);
  box-shadow: var(--shadow-lift);
}

.site-sidebar__toggle[aria-expanded="true"] {
  background: var(--olive);
  border-color: var(--olive);
  box-shadow: none;
}

.site-sidebar__toggle[aria-expanded="true"] span {
  background: var(--white);
}

.site-sidebar__toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.site-sidebar__toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.site-sidebar__toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

.app-main {
  width: calc(100% - var(--sidebar-width));
  margin-left: var(--sidebar-width);
  min-height: 100vh;
  min-height: 100dvh;
  background: var(--white);
  overflow-x: clip;
}

body.sidebar-open::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 4980;
  background: rgba(42, 37, 33, 0.4);
  pointer-events: auto;
}

.mobile-header {
  display: none;
  pointer-events: none;
}

.mobile-header__logo {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  margin-top: calc(var(--safe-top) / 2);
  line-height: 0;
  text-decoration: none;
  pointer-events: auto;
}

.mobile-header__logo-img {
  display: block;
  width: auto;
  height: 3.35rem;
  max-width: 14rem;
  object-fit: contain;
}

@media (max-width: 899px) {
  .mobile-header {
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 5000;
    height: calc(3.25rem + var(--safe-top));
    padding-top: var(--safe-top);
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: var(--border-subtle);
    box-shadow: var(--shadow-soft);
    pointer-events: none;
  }

  body.sidebar-open::before {
    content: none;
    display: none;
  }

  .site-sidebar {
    z-index: 5000;
    transform: none;
    width: auto;
    height: auto;
    bottom: auto;
    right: auto;
    background: transparent;
    border: none;
    padding: 0;
    pointer-events: none;
    overflow: visible;
  }

  .site-sidebar.is-open {
    pointer-events: auto;
  }

  .site-sidebar__drawer {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 5001;
    width: 100%;
    max-width: 100%;
    height: 100dvh;
    max-height: 100dvh;
    padding: calc(3.25rem + var(--safe-top)) 1.15rem max(1rem, var(--safe-bottom)) max(1.15rem, var(--safe-left));
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
    background: linear-gradient(180deg, var(--surface-warm) 0%, var(--surface) 100%);
    border-right: none;
    box-shadow: var(--shadow-lift);
    overflow-x: hidden;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
    transform: translateX(-100%);
    transition: transform 0.35s ease;
    pointer-events: auto;
  }

  .site-sidebar__drawer .site-sidebar__logo {
    display: block;
    padding-bottom: 0.25rem;
    margin-bottom: 0.15rem;
  }

  .site-sidebar__drawer .site-sidebar__logo-img {
    max-width: 100%;
  }

  .site-sidebar__drawer .site-sidebar__nav {
    flex: 0 0 auto;
    flex-grow: 0;
    flex-shrink: 0;
    min-height: auto;
    height: auto;
    overflow: visible;
    padding: 0.1rem 0 0.5rem;
  }

  .site-sidebar__drawer .site-nav__list {
    gap: 0;
  }

  .site-sidebar__drawer .site-nav__link {
    padding: 0.42rem 0;
    font-size: 1.02rem;
  }

  .site-sidebar__drawer .site-sidebar__footer {
    flex: 0 0 auto;
    margin-top: 0;
    padding-top: 0;
    gap: 0.7rem;
    border-top: none;
  }

  .site-sidebar__drawer .site-sidebar__quiz-panel {
    order: 1;
    padding: 0.75rem 0.85rem 0.75rem 0.95rem;
  }

  .site-sidebar__drawer .site-sidebar__quiz-eyebrow {
    margin-bottom: 0.3rem;
    font-size: 0.56rem;
  }

  .site-sidebar__drawer .site-sidebar__quiz-title {
    font-size: 1rem;
    line-height: 1.2;
  }

  .site-sidebar__drawer .site-sidebar__quiz-sub {
    font-size: 0.7rem;
  }

  .site-sidebar__drawer .nav__lang {
    order: 2;
    align-self: flex-start;
  }

  .site-sidebar__drawer .nav__book {
    order: 3;
    min-height: 2.75rem;
    padding-top: 0.65rem;
    padding-bottom: 0.65rem;
    font-size: 0.9rem;
  }

  .site-sidebar.is-open .site-sidebar__drawer {
    transform: translateX(0);
  }

  body.sidebar-open .mobile-header {
    display: none;
  }

  .site-sidebar__toggle {
    display: inline-flex;
    flex-direction: column;
    pointer-events: auto;
    z-index: 5100;
    top: max(0.72rem, calc(var(--safe-top) + 0.35rem));
  }

  .app-main {
    width: 100%;
    margin-left: 0;
    padding-top: calc(3.25rem + var(--safe-top));
  }
}

@media (prefers-reduced-motion: reduce) {
  .line-sidebar__label {
    transform: none;
  }

  .site-sidebar {
    transition: none;
  }

  .site-sidebar__drawer {
    transition: none;
  }
}